/Engine/Source/Runtime/Slate/Public/Widgets/Layout/SUniformGridPanel.h
Dynamically add a new slot to the UI at specified Column and Row.
A reference to the newly-added slot
[FScopedWidgetSlotArguments](API\Runtime\Slate\Widgets\Layout\SUniformGridPanel\FScopedWidgetSlotArguments) AddSlot ( int32 Column, int32 Row )